Java后台实现微信支付和微信退款

微信支付流程

都是我自己工作中开发的，亲测可用，不喜勿喷。

controller中我是这么写的，你们需要根据自己的业务需求改动。ResponseBean是我自己封装的，你们可以改成你们想要的形式。

 /**
   * 微信统一下单接口
   * @return
   */
  @RequestMapping(value = "/doUnifiedOrder", method = RequestMethod.POST)
  public ResponseBean doUnifiedOrder(@RequestBody Map<String,Object> req) {
    Map resultMap=new HashMap();
    String openid = (String) req.get("openId");

    WXPay wxpay =null;

    try {
      //初始化证书
      myConfig.initCert();
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的随机字符串
    String nonce_str = WXPayUtil.generateNonceStr();
    //获取客户端的ip地址
    //获取本机的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金额，需要转成字符串类型，否则后面的签名会失败
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));
    String tradeName = (String) req.get("tradeName");
    if(tradeName!=null&&tradeName.length()>0){

    }else{
      tradeName = "课程支付";
    }
    String body = tradeName;
    //商户订单号
    String out_trade_no= WXPayUtil.generateNonceStr();
    //统一下单接口参数
    HashMap<String, String> data = new HashMap<String, String>();
    data.put("appid", 你的appid);
    data.put("mch_id", 商户id);
    data.put("nonce_str", nonce_str);
    data.put("body", body);
    data.put("out_trade_no",out_trade_no);
    data.put("total_fee", payOutMoney);
    data.put("spbill_create_ip", "127.0.0.1");
    data.put("notify_url", 回调地址);
    data.put("trade_type","JSAPI");
    data.put("openid", openid);
    try {
      Map<String, String> rMap = wxpay.unifiedOrder(data);
      String return_code = (String) rMap.get("return_code");
      String result_code = (String) rMap.get("result_code");
      String nonceStr = WXPayUtil.generateNonceStr();
      resultMap.put("nonceStr", nonceStr);
      Long timeStamp = System.currentTimeMillis() / 1000;
      if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {
          String prepayid = rMap.get("prepay_id");
          resultMap.put("package", "prepay_id="+prepayid);
          resultMap.put("signType", "MD5");
          //这边要将返回的时间戳转化成字符串，不然小程序端调用wx.requestPayment方法会报签名错误
          resultMap.put("timeStamp", timeStamp + "");
          //再次签名，这个签名用于小程序端调用wx.requesetPayment方法
          resultMap.put("appId",myConfig.getAppID());
          String sign = WXPayUtil.generateSignature(resultMap, myConfig.getKey());
          resultMap.put("paySign", sign);
          resultMap.put("out_trade_no",out_trade_no);
          ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付",resultMap);
          return responseBean;

      }else{
        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失败","微信支付失败");
        return responseBean;
      }
    } catch (Exception e) {
      ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信支付失败","微信支付失败");
      e.printStackTrace();
      return responseBean;
    }
  }

微信退款代码（需要传退款的订单id）

  public ResponseBean refund(Map<String, Object> req) {
    Map resultMap=new HashMap();
    String buyId = (String) req.get("buyId");
    WXPay wxpay =null;
    try {
      myConfig.initCert();//初始化证书
      wxpay= new WXPay(myConfig);
    } catch (Exception e) {
      e.printStackTrace();
    }
    //生成的随机字符串
    String nonce_str = WXPayUtil.generateNonceStr();
    //获取客户端的ip地址
    //获取本机的ip地址
    InetAddress addr = null;
    try {
      addr = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
      e.printStackTrace();
    }
    //支付金额，需要转成字符串类型，否则后面的签名会失败
//    int total_fee= (int) req.get("money");
    String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get("money")));

//    String body = (String) req.get("z");
    //商户订单号
    String out_trade_no= WXPayUtil.generateNonceStr();
    //统一下单接口参数
    HashMap<String, String> data = new HashMap<String, String>();

    try {
      data.put("appid", myConfig.getAppID());
      data.put("mch_id", myConfig.getMchID());
      data.put("nonce_str", nonce_str);
      data.put("sign_type", "MD5");
      data.put("out_trade_no",buyId);//微信订单号
      data.put("out_refund_no", out_trade_no);//商户退款单号
      data.put("total_fee",payOutMoney);//支付金额，微信支付提交的金额是不能带小数点的，且是以分为单位,这边需要转成字符串类型，否则后面的签名会失败
      data.put("refund_fee",payOutMoney);//退款总金额,订单总金额,单位为分,只能为整数
      //MD5运算生成签名，这里是第一次签名，用于调用统一下单接口
      String sign = WXPayUtil.generateSignature(data, myConfig.getKey());
      data.put("sign", sign);

      Map<String, String> rMap = wxpay.refund(data);
      String return_code = (String) rMap.get("return_code");
      String result_code = (String) rMap.get("result_code");

      Long timeStamp = System.currentTimeMillis() / 1000;
      if ("SUCCESS".equals(return_code) && return_code.equals(result_code)) {

        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款成功",rMap);
        return responseBean;

      }else{
        ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款失败","微信支付失败");
        return responseBean;
      }

    } catch (Exception e) {
      ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),"微信退款失败","微信支付失败");
      e.printStackTrace();
      return responseBean;
    }
  }

需要用到的工具类

然后在MyConfig中配置一下你们的小程序参数就行了，如果需要添加退款功能必须配置商户证书（对应在你项目中的位置）。不需要的话就把initCert方法去掉。

public class MyConfig extends WXPayConfig {
  @Value("${res.imgPath}")
  public String imgPath;

  private byte[] certData;

  @Override
  public String getAppID() {
    return "你的小程序id";
  }

  @Override
  public String getMchID() {
    return "商户id";
  }

  @Override
  public String getKey() {
    return "商户秘钥";
  }

  @Override
  public InputStream getCertStream() {
    ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData);
    return certBis;
  }

  @Override
  public int getHttpConnectTimeoutMs() {
    return 8000;
  }

  @Override
  public int getHttpReadTimeoutMs() {
    return 10000;
  }

  @Override
  IWXPayDomain getWXPayDomain() {
    return new IWXPayDomain() {
      @Override
      public void report(String domain, long elapsedTimeMillis, Exception ex) {
      }

      @Override
      public DomainInfo getDomain(WXPayConfig config) {
        return new DomainInfo("api.mch.weixin.qq.com", false);
      }
    };
  }

  @Override
  public void initCert() throws Exception {
    String certPath = this.imgPath+"/upload/cert/"+"apiclient_cert.p12";//从微信商户平台下载的安全证书存放的目录
    System.out.println(certPath);
    File file = new File(certPath);
    InputStream certStream = new FileInputStream(file);
    this.certData = new byte[(int) file.length()];
    certStream.read(this.certData);
    certStream.close();
  }
}

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